119th General Meeting of the KCS

Type Poster Presentation
Area 무기화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code INOR.P-96
Subject Synthesis, structure determination, characterization and magnetic property of a new lithium manganese selenite
Authors 조홍일, 옥강민*
중앙대학교 화학과, Korea
Abstract A new lithium manganese selenite has been synthesized by hydrothermal and solid state reactions using Li2CO3, Mn2O3, and SeO2. A hexagonal crystal was used to determine the crystal structure using single crystal X-ray diffraction. The selenite crystallizes in the rhombohedral space group, R-3. The selenite reveals a zero dimensional structure consisting of MnO6 octahedra, SeO3 trigonal pyramids, and Li+ ion. Mn3+ cations is are surrounded by six Se(1)O32- ions, which forms Mn(SeO3)6 octahedral structures. Regarding Li-O bond as a covalent bonding, while Li(1) and Li(2) forms LiO4 tetrahedral environment with oxide ligands, and Li(3) builds LiO6 trigonal antiprisms. Li(3)O6 is connected with six Li(2)O4 tetrahedra by edge- sharing along the ab-plane. Two Li(1)O4 makes share their edges through O(4) and form a Li(1)2O6 dimer by edge sharing through O(4) and the dimer are is further bonded to Li(2)O4 via O(2). Se(2)O(4)3 is linked to Li(1)2O6 and Li(2)O4. As extend Li, Se and O linking, a lithium selenite layer is constructed along the ab-plane. Mn(SeO3)6 octahedral structures are inserted in these layer and they share O(2) and O(3). Ignoring the Li-O covalent bond, the framework of Li13M(SeO3)8 is considered as an anionic structure composed of Li+, SeO32- and [Mn(SeO3)6]9-. Full characterization including thermal analyses, magnetic property measurements and spectroscopic analyses such as electron paramagnetic resonance, Infrared, UV-vis, and X-ray photoelectric spectroscopy will be presented.
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